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The prime mover for flexion of the shoulder muscles used are the following: 1  Pectoralis Major Clavicle. 2  Anterior Deltoid. 3  Biceps Brachii Short Head. 4  Coracobrachialis.
The shoulder muscles are appendicular muscles that attach to the appendicular skeleton. That is the bones of the arm and leg. The shoulder muscles serve to stabilize our pectoral girdle and move our arms. This lesson will identify and describe the main muscles associated with the shoulder.